[INFO] fetching crate shuttle 0.0.7...
[INFO] testing shuttle-0.0.7 against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] extracting crate shuttle 0.0.7 into /workspace/builds/worker-78/source
[INFO] validating manifest of crates.io crate shuttle 0.0.7 on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate shuttle 0.0.7
[INFO] finished tweaking crates.io crate shuttle 0.0.7
[INFO] tweaked toml for crates.io crate shuttle 0.0.7 written to /workspace/builds/worker-78/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded varmint v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fced93c526084375619002173ef9ca64938d72a1026f48c9d19fe35c0d5d64bd
[INFO] running `Command { std: "docker" "start" "-a" "fced93c526084375619002173ef9ca64938d72a1026f48c9d19fe35c0d5d64bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fced93c526084375619002173ef9ca64938d72a1026f48c9d19fe35c0d5d64bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fced93c526084375619002173ef9ca64938d72a1026f48c9d19fe35c0d5d64bd", kill_on_drop: false }`
[INFO] [stdout] fced93c526084375619002173ef9ca64938d72a1026f48c9d19fe35c0d5d64bd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-78/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2907a0fe7a0ad46eccb5c3152c4c18fb1c7b78f1e319e36c1c41248969b93adb
[INFO] running `Command { std: "docker" "start" "-a" "2907a0fe7a0ad46eccb5c3152c4c18fb1c7b78f1e319e36c1c41248969b93adb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling rustversion v1.0.5
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]    Compiling funty v1.2.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.7
[INFO] [stderr]    Compiling wyz v0.2.0
[INFO] [stderr]    Compiling hex v0.4.3
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling varmint v0.1.3
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling scoped-tls v1.0.0
[INFO] [stderr]    Compiling tracing-core v0.1.21
[INFO] [stderr]    Compiling tracing v0.1.29
[INFO] [stderr]    Compiling bitvec v0.21.2
[INFO] [stderr]    Compiling generator v0.7.0
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling shuttle v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] error: `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
[INFO] [stdout]    --> src/asynch.rs:162:1
[INFO] [stdout]     |
[INFO] [stdout] 162 |   #[must_use = "yield_now does nothing unless polled/`await`-ed"]
[INFO] [stdout]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 163 | / pub async fn yield_now() {
[INFO] [stdout] 164 | |     /// Yield implementation
[INFO] [stdout] 165 | |     struct YieldNow {
[INFO] [stdout] 166 | |         yielded: bool,
[INFO] [stdout] ...   |
[INFO] [stdout] 184 | |     YieldNow { yielded: false }.await
[INFO] [stdout] 185 | | }
[INFO] [stdout]     | |_- this attribute does nothing, the `Future`s returned by async functions are already `must_use`
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:1:9
[INFO] [stdout]     |
[INFO] [stdout] 1   | #![deny(warnings, missing_debug_implementations, missing_docs)]
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_attributes)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `shuttle` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2907a0fe7a0ad46eccb5c3152c4c18fb1c7b78f1e319e36c1c41248969b93adb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2907a0fe7a0ad46eccb5c3152c4c18fb1c7b78f1e319e36c1c41248969b93adb", kill_on_drop: false }`
[INFO] [stdout] 2907a0fe7a0ad46eccb5c3152c4c18fb1c7b78f1e319e36c1c41248969b93adb